Update clone dependency to >=2.1.1 <2.2 (#1359)
Update clone dependency to >=2.1.1 <2.2 (#1359)

In version 2.1.1, CloneJS improved support for Internet Explorer. See
this pull request for details: https://github.com/pvorb/clone/pull/77
sferoze/quilljs,voxmedia/quill,sferoze/quilljs,quilljs/quill,voxmedia/quill,willrowe/quill,quilljs/quill,willrowe/quill,sferoze/quilljs,willrowe/quill,voxmedia/quill,quilljs/quill,sferoze/quilljs